<template>
  <div class="login-container">
    <div class="login-box">
      <!--头像区域-->
      <div class="avatar-box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--登录表单区域-->
      <el-form
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
        label-width="0"
        class="login-form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            type="password"
            prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="submitForm('loginFormRef')">登录</el-button>
          <el-button type="info" @click="resetForm('loginFormRef')">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data(){
      return{
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        // 表单验证规则
        loginFormRules: {
          username: [
            { required: true, message: '请输入用户名', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
          ]
        }
      }
    },
    methods: {
      submitForm(formName) {
        this.$refs[formName].validate(async (valid) => {
          if (!valid) return;
          const {data: res} = await this.$http.post('login', this.loginForm);
          // console.log(res);
          if (res.meta.status !== 200){
            this.$message.error('登录失败');
            return;
          }
          this.$message.success('登录成功');
          // 1.将登录成功后的token保存在客户端的sessionStorage中
          //  1.1.项目中除了登录之外的其他API接口必须在登录后才能访问
          //  1.2.token只能在当前网站打开期间有效，所以将token保存在sessionStorage中
          window.sessionStorage.setItem("token", res.data.token);
          window.sessionStorage.setItem("userName", res.data.username);
          // 2.通过编程式导航跳转到后台主页，路由地址是/home
          this.$router.push("/home");
        });
      },
      // 重置登录信息
      resetForm(formName) {
        this.$refs[formName].resetFields();
      }
    }
  }
</script>

<style lang="less" scoped>
  .login-container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login-box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar-box{
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .login-form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns{
    display: flex;
    justify-content: flex-end;
  }

</style>
